Machine for fabricating strakes for boat construction or the like



A. G. S. SANDISON MACHINE FOR FAB May 31, 1949. 2,471,780

RICATING STRAKES FOR BOAT CONSTRUCTION OR THE LIKE s Sheets-Sheet 1 Filed Aug. 23, 1944 y 1949- A. G. s; SAN DISON 2,471,780

MACHINE FOR FABRICATING STRAKES FOR BOAT CONSTRUCTION OR THE LIKE Filed Aug. 23, 1944 5 Sheets-Sheet 2 fave/2722'.

May 31, 1949. A. e. s. SANDISON MACHINE FOR FAB 2,471,780 RICATING STRAKES FOR BOAT CONSTRUCTION OR THE LIKE 5 Sheets-Sheet 3 "7' 3 f/Q/M.

form/'0)? Filed Aug. 25, 1944 May 31, 1949. A. G. s. 's Nms 2,471,780

MACHINE FOR FABRICATING STRAKES FOR BOAT CONSTRUCTION on THE LIKE Filed Aug. 25, 1944 5 Sheets-Sheet 4 Mf/M.

A. G. s. SANDISON 2,471,780 MACHINE FOR FABRICATING STRAKES FOR BOAT CONSTRUCTION OR THE LIKE 5 Sheets-Sheet 5 [0 Van/5x May 31, 1949.

Filed Aug. 25, 1944 Patented May 31, 1949 MACH IN E OFFICE 'FOR 'FABRICATING STRAKES FOR,

1BOATCONSTRUCTION on THE LIKE- Alexander Gxeewolde {Seymour Sandison, Brentford, ario, Can d Application August 23, 1944, SerialNo. 550.738 y In Canada January. 24, 1944 .9 Cl ims- 1 u'lhisstinvention rel-atestowa ma hinefor. febri- :enting st-xakes {for boat construction or the like.

.JAn object tot the inventinn is to provide mean whereby strekeepf a. type cap bletofiassemblytt vziyform $13811; orelleftheskin oiwbcet-pf az erh i typenma'y befabIiGMfid WHh their ed e cut-fil the correct: centonrwandwenele of bevel and, i ;sorequined, a1so withholes at the ,egrnect angles receive edge fastenin s- The invention is exempli ed in theac om anw q Fig. -7 is a :tiieerammetic seetio ef a .str k 1 1 su h; as may b formed-by the mac ine.

Fig. 18 2153" d e rammetic section alterna ivet that shown in Fig. 7.

.To iecilitate the sleser pt n \of t e d rect o .of operat ng movementinormous of the mecht' aenis he pa t 1015 the ma h ne sh wn en the-lef of Fi s. l t-and Land on theww npmt en f F gs 3 and 5 will be reeand d escompr sirie the rom. :and; the o pos e p r on he back or: the machine, and the words rightWand Jeft h ree tusedv re to: hev nterp eted as m ter in to t tviewsushownlin Figs, 2, ,3 or 5.

Beferringtefigs. 1 to fi'kinclusive vet -be gltl has straight longitudinal we sfiz amm, enem table 4 with means eempr sme elamps 5, stud Mrhand nuts a for clamp n the work? sh w chain dotted ne. Below :wa-ysr .2 is semi-re ipu ed i it d pen n age nthe ap between th ha- 1 I 0, A pin on I9 meshe -Wit there k 9 endis m unted e e r nsv tse shaf min-P o i d ith :a ke and iour e -in th we. longitudinal rack -,9 and belewthis ragkwa i s r es of lon itudinellyv disp sed Jeers: Ian f equa nlen th-and ally: p cedel-one the bed so tha a the vgapsv between, their enclsdare equal. A- sagid le U i av n transv nseways I .2: is slidab mmmte en t e ways :2 end :3 end as vertical eb ifldoceted' in: noX' ityttotthe re kufi. Lap-dila ways 1 An eprp mieee .5 :is fl1lrd- $101 th :Irent efath sadd e, Atmnsv itse be Iii m0- visiecl With an @pem h mh d 1 tend .stop. p -rl8-is 1ida 1v suppontedwbvthe epno hiee I :and web 43 in such a msit oh that when pwendly extendin as 14 loea etiwlbetween th $50 web I43. .Another.transverse shaft 22 eo-axiel with shaft 20 .is journalled .in the apron piece .15 end h s sec red t9 :it on its imnt end c an e an h el zi and handw e 24 and at it ea Lend-es im b e leeve 25 pnov ded ih a an ety e h n l -36 an a slo wh ch s siablyen- @geees a tkeyt'28- ec re o t e aft 2-2: Theen shaft: 20 oea s i th rea e d f e eev W2 5, which is {p ov ded wi h e s ot toeneeee y i- A sp in 29 no ma ly hold t e sle ve-in the eneee e os t onch n e eearwh el 'w meshing with the gearwheel 2,3 is vsecuredto a "trahsverseshat i 3Lj9urna1ledin the apron piege i5 andwfib n and: having secured to it a, worm 32. A wermwheel 3,3 meshing withqworm 1324s 20 seeuredttethelower end of a vertical shafttgl t h xt nd u wa th ou h and is j ur ela e in theho s M an is ovi ed a it up e en with -.a1tlo eta- =shepe a 35 havi a lideble a d 36 ca rying a in hea a ubxstantielly thesame level as the Work :8. CHQIII- ,qp n tfi; 3 e d-. 7 wi l b nd tood t eemact es a crank ,;or eccentric with adjustable w'throw- A, eib 3 andsets ew 39 r d mean for clampin t ee ddl -35 in n de i ed 1 .0-

web on along t e-heed 3 A slide s idabl meunted on the transverse :ways l2 of the saddle ll and. carries whateis substantially ,al-type of -mntqe a t mefiha m icpmprisine a me ee-141 vwe i -am 42,1'tetm d he fi f m and mmunecting link it 43 The yoke 41 is DiEVQtQIHY imqunted 011 pins, secured to the slide 49,..ggd a riesio t uppe end La -pi 5 onw ehth eonn ct nguli k 43 p ots an i p ov ded-w t 1a transversemlatgfprm 4 6 provided with lmtgitzudin wweyshe z o e al h a down- Wa dlv extendi e ee v" 1, e m ed of whic is strai ht. {Bhe frame .42 is; [pivotal-1y mounted ,on tpi-ns QB- secured to the slide 0 and has an ear-m :49 harmin he p n wh th @91 lne tinew1 n 1 3 vots he upn h rt of fram 42 has ways 5 n which is lda v m unted;

motortfilttglriving a putter 53 in Juxtapgsitipn to thewerk 8- N ntiea Yda stm nw t e mete -52 end Qu rfids ptovid d io by th tud 5 use uted to the mete wand-th :h nd he l 5 threaded on the stud 54 etndbearing on theendplate 56 attached to the top of'frame 42. The

cinem .42 e se meet ne-. iie te m 5? end -i sabetween these -0n pins 160. {,IIhe drill located at the end of the strake.

3 frame 59 has slidably mounted on it a motor 6| driving a drill or other cutting tool 62. A. handle 63 projecting through a slot in the drill frame 59 and attached to the motor 6| is provided for imparting sliding feed movement to the motor 6| and drill 62. The longitudinal distance between the centre'line of the drill 62 and the centre line of the cutter 53, when the mechanism is in the position shown in Fig. 5, is equal to the pitch circumference of the pinion I9. The drill frame 59 is also provided at its free end with a vertically disposed face 64 in line with the axis of the motor 6| and drill 62. A tension spring 65 extends between a pin 66 secured to the drill frame 59 and a pin 61 secured to the frame 42. A clamp link 68 is fitted at one end on the pin 50 and is provided at the.

other end with a slot 69 which registers with a stud 16 secured to the yoke 4|. The stud T is fitted with a nut H and washer 12 whereby the link 68 may be clamped. A vertical bar 13 is secured to the saddle A carrier 14, slidably mounted on the bar 13, carries a pin 75, 'which is located in juxtaposition to the front edge of the leg 41 of the yoke 4|. A setscrew 16 provides means for locking the carrier 14 in any desired position along the bar 13. A spring "extending between the inner end of pin 45 and a spring support 18 secured to the saddle tends to pivot the yoke 4| in such a manner that the front edge of its leg 41 normally presses on pin 15. Aneccentric follower consisting of a longitudinally dsposed bar 19 is slidably supported on the yoke 4| on substantially the same level as the work 8, and has in its rear edge a notch 80 engaging the pin 31, and on its top surface a transverse groove 8|. An arm 82, pivotally mounted on a pin 83 secured to the platform 46 of the yoke 4|, is provided with a slot 84, and is fitted with a downwardly extending pin 85 engaging the groove 8| in the bar 19. Another downwardly extending pin 86 can be clamped in any position along the slot 84 by means of the nut 81 and washer 88; Another longitudinally disposed bar 89 is slidably mounted on the Ways of the platform 46 of the yoke 4| and has a pin 9|] which contacts and controls the location of the vertically disposed surface 64 of the drill frame 59, and is provided with a transverse groove 9| which is engaged by the end of pin 86. It will be understood that bars 19 and 89, in conjunction with arm 82 and its attachments, act as an adjustable motionreducing mechanism, the longitudinal movement of the bar 19 relative to yoke 4| being transmitted to the bar 89 reduced in an adjustable ratio. The mechanism is so arranged that when positioned as shown in Fig. with the head 35 at right angles to the line of the ways 2-,

' the arm 82 and the axis of the motor6| are also at right angles to the line of the ways 2.

Referring to Figs. 6 and 7, which are merely illustrative of the type of work which may be performed by a machine in accordance with this invention, the line O-X is the centre line of the symmetrical strake 8, y is the measurement from the edge of the strake to the line OX and a: is the measurement from the origin 0 The edge of the strake is shaped according to the equation of design and some of-which, of course, may be zero or negative. It will be understood that these constants have the meaning normally attached to the use of such constants in a mathematical formula of this nature and that the constant A determines the amplitude of the sine wave, the constant B determines the length of the sine wave, the constant C relates to the position of the sine wave as regards its distance from the origin 0, the constant D relates to a uniform degree of slope in respect to the axis O-X, this uniform slope being superimposed on the variable slope of the sine Wave, and the constant E relates to the position of the sine wave as regards its distance from the axis OX, and where these constants are used hereinafter in this specification they are to be understood as having the same meanings as are here indicated. In the present example, it will be assumed for purposes of illustration that the constant C is zero so that Bzc+C is equal to Zero at one end of the strake and also that the constant B is such that Br-l-C (expressed in radians) is equal to 1r at the other end of the strake. That is to say that, in the particular case considered, B=1r/L, where L is the length of the strake, and 0:0. The edges of the strakes are bevelled at an angle a, and for the purposes of this example, it is assumed that on is to be such that tan a equals F sin (Bx-i-C), where F is a constant, over that portion of its length where Bat+C lies between zero and .1r/2, and is to be such that tan 0: equals F over that portion of its length where Bx-i-C' lies between 1r/2 and 1r. The strakes are also provided with holes 92 drilled in the edges, these holes being'spaced at equal longitudinal intervals and each hole being perpendicular to the surface of the edge at the position Where it is located. The use of strakes of this general type for assembly to form the bilge portion of the hull of a boat is described in another patent application (Serial No. 550,741, filed August 23, 1944) by the present inventor, this application having issued as Patent No. 2,397,049, dated March 19, 1946.

Referring to Fig. 8, a cross section of a strake alternative to that shown in Fig. 7 is formed with tongue 93 and groove 94, also cut at an angle of bevel or.

To exemplify the operation of the machine, it is assumed in the following description that it is desired to profile and drill a strake of the type described with reference to Figs. 6 and 7. The

initial position in such a, case is substantially as shown in Figs. 1, 2 and 3 and the set up may be prepared as follows:

The machine is fitted With a pair of change gearwheels 23 and 39 of such ratio that the wormwheel 33 will rotate 180 (or 1r radians) when the saddle II is traversed longitudinally,

by means of the rack and pinion gear, a distance equal to the length of the strake. The saddle 36 is locked on the dovetail 35 in such a position that the axis of the pin 3'! is eccentric'from the shaft 34 by an amount equal to A. The carrier 14 is then located in such a position that the ratio of A to the vertical distance between the bar 19 and pin 15 is equal to F. The work 8 is then located on table 4 and held down by the clamps 5. The location of the work should be such that, in the position of the machine mechanism shown in Figs. 1, 2 and 3, the cutter should be opposite the end of the strake and distant from the intended centre line thereof by a distance equal to E and the intendedcentre line should slope towards the back .ebfuthe machine in relation to :the. line ofxthe ailohgitudinal ways 52 and 3 byan amount of slope per unitlength :equalvto D. This settin moespnot theoretically resultrin work in strict rmathematical accordance :with the formula, but tthe approximation thereto is extremely closetin 'rpracticalicases where D is small. The settin ziisonowicomplete :for=the operation of profiling ethe edge ofthe strake.

:It will .be understood .that the \tension of espring .11 pulling on pin .45 tends to pivotthe yoke AI .in such amannerthatmthe front of its lileg ill is constantly pressed against pin 1.5, prowvided that the clamp link 68 is unclamped;

i -moreover; the horizontal componenthof the tension of the spring, assisted by the pressureexz-erted between the pin li'andleg 4! tends to z-move the slide 40 along the ways I2 towards the back of the machine so thatthe'position taken up by the slide is such'that thenotch 80 of bar W8 is continuously maintained in contact with the-pin 31. Owing to the action of the panto- "gra-ph mechanism the cutter53 receives the same transverse movement as the bar I9 and is also :deflected from the vertical to the same extent as :the yoke 4 I.

In operating the machine to profile the edge notthe work 8, the handwheel 24 is rotated clock- "wise in front View to traverse the saddle II and its attached mechanism to the left along.

'the'ways '2 and 3 by the action of the pinion -I 9 andrack 9. During the first portion of this traverse the clamp link 68 is free. As the traverse proceeds the shaft 34 and the mechanism secured thereto is rotated clockwise in plan view by means of the gearwheels 23 and "30, worm 32 and wor-mwheel 33, sothat the pin 31, acting on the bar-I9, causes this bar, and therefore also the cutter '53..to1move progressively towards the front of-the machine, and at the same pantograph mechanism is locked by clampingzthe clamp link :68 by tightening the nut ll; andthe rtraverse is then continued. During the second part of this traverse, therefore, the yoke4I and x cutter :53 remain at a constant angle of tilt, this angle of tilt remaining the same as in the positions shown in Figs. 4 and 5, while theleg 41 .of .yoke 4| moves away from the pin I5 asthe yoke moves towards the back of the machine. At the same time the cutter 53 continues to sreoeive the same transverse movement "asthe Jam 19 receives through its contact with the pin :31, as the mechanism comprising the slide 40 and the attached pantograph mechanism and cutter moves bodily as a unit. Consideration of the geometry of the mechanismin conjunc- :tion with the initial settingspreviouslyreferred =-to will show thattheedgeof the work is cut tola contourand toangles of bevel substanrtiallyaas havezbeen described with reference to Figs. 6 and 7. xThus whether the pantograph -mechanism is locked or free, I the cutter 53 re.- lGBiYGS the same frontward. movement as the eoxcentric pin 31 and thefrontward displacement ef this pin (in relation to. the longitudinal plane the strake.

YA. sin flirt-k0) 1 as zit fis rset at .18, radius equal "t A and driventinl the ra io previ usly "spec fied which, with the 1 particular values of B .and 1C chosen in the example, causes .it 1.to rotate in rad ns a ile I. the mutter travels :the len th .Q lhe distance between t the centre line of the strake andtheedge 10f theworkaat cordance withthe equation 21=A s n -P +E Moreover, du inaeuchtime a th pa teereph mee anismi f ee toi ivet. h n e t ei h a e o t a s een o e e atio of the frontwardldis la m nt of th pin 3 n ela ion o t n ud nal p a nt r tin its-axis o at o t the ve t cal d st nce betwee th ba 1 and bin 15 which, with the settin specified sento b :Fsin n+0) 1so=that eve hat p rtio of e l nsth t est a s where the pantograph mechanism was leftfree pi o th 'is ossa ver that p tien of t nsth h r Bw+C es be ween e o-and-r/Z,

t e a e o J w @11 0 which I the stroke dge was wa su than ten e was e ual 112 .F sin (Bar-l-C'). After therpen esraph me hah was lo ked the a sen 0 e a sleef be e em ned at sin M and; s n sin Mn i equal: to 1,tan-wisw een be e ualwte eve tha p i nof the st ak nit setting of hexmae n o hep rpo e n I dr li the ho e ri l th W01 i 8, a described e ren e to Rise: 6 and 'i, it isas um dthat I c nside in th the saddle II has been returned to thesameehd of the bed as that; from which the profiling .op-

'eration was commenced, but in such a position that the drill-62 isoppositethe end of the Work,

t at th lamp link 6 as een uncl mp d-and that the handweel 55. hasbeen operated to ra se the motor 52 so that the cutter=531is clear ef the work B. In .thisposition the mechanism driven through the change gearwheels 23 and 30 will not be in the same positionas is shown in Figs. 1, 2 and .3; that iStosay not in the same position as when the cutter 53 was opposite the end of the work, as" the saddle II is now in a longitudinal position differing from that shown in Figs. 1,..2'and 3 to the extent of the longitudinal distance between the aXes:of the cut.- ter 53 and drill 62, which has previously been stated as being equal tothe pitchcircumference -of the pinion I9. .11; .is:.evident, thereforethat the position of the mechanism driven through the changegearwheels 23 and 3D differs from that shown in Figsl, Zand 3 to an extent equivlent to that producedl-by one revolution of the handwheel 24, and to compensate for this the sleeve 25 is pulled forward by its handle 26 so that theslot in itsend disengages the key 2|, and

the handwheel 24 is turnedthrough one revolution, returning the mechanism driven through the change gearwheels 23and 3ll to the position shown in Figs. 1, 2 and 3, while leavingthesaddle I I in such longitudinal position that the drill :62 instead of the cutter 53 is opposite ithelend of the work 8. The-'sleeve 25 is then allowed tore-engage the key :2I. "The pin 86 is now adjusted andsec-urecl in sucha position along intersecting its axis 1 of rotation) .isseen to I be r 7 3 the slot 840i arm-82 that theratioof reducand fixing the position of the saddle ll.

tion of the motion-reducing mechanism linking the bars 89 and 19 is such that the ratio of movement of bar 89 to that of bar 19 is equal to the distance between the axes of pins 90 and 60 multiplied by the constant B. The other adjustments of the machine are left the same as in the profiling operation.

In the operation of edge-drilling the work, the handwheel 24 is operated to traverse the saddle and its attached mechanism until the end of bar I6 is opposite one of the gaps between the bars l0, whereupon knob I"! is pushed inward so that the end of bar It enters the gap, thus locating The drill 62 is then operated to drill the edge of the work by moving the motor 6| along its slides by means of the handle 63, thus feeding the drill into the work. Succeeding holes are drilled in a similar manner, longitudinal location bein made at successive gaps between the bars l9. As in the case of the profiling operation, the

pantograph mechanism is locked by clamping the clamp link 68 when the pin 31 reaches its maximum frontward position, and the drilling process is carried out over the remaining length of the work with the pantograph mechanism locked.

As the longitudinal traverse proceeds the movement of the pin 31 engaging the notch 80 in the bar 19 causes longitudinal movement of 7 this bar to the left relatively to the yoke 4|, and

by the action of the motion-reducing mechanism, comprising the groove 8|, pin 85, arm 82,

' pivot 83, pin 86 and groove 91, causes a similar but reduced longitudinal movement of the bar 89. The pin 90 secured to bar 89 and pressing on the face 64 of the drill frame 59 causes angular movement of the drill frame, and of the motor 6| and drill 62 mounted thereon, about the pins 60.

It will be understood that the drill 62 is subject to the same amount of tilt in a vertical plane at each drilling position as was imparted to the cutter 53 at the same longitudinal position during the profiling operation, so that perpendicularity of each hole to the profiled edge surface of the work is assured in the Vertical plane. Also it is the property of the curve y=A sin (Br-PC) that its slope dy/dat at any point is equal to AB cos (BaJ-i-C) The longitudinal displacement of bar 1'?) from its central position, measured relatively to the yoke 4|, is seen to be equal to A cos (B:c+C) and, ow-

ing to the adjustment mentioned in relation to the position of pin 89, the displacement of bar 89 and pin 91? is equal to AB cos (Bra-C) multiplied by the distance between the axes of pins 90 and 60, so that as the drill frame 59 pivots about the pins 89 the slope of the drill in the horizontal plane (referred to an axis perpendicular to the line of the Ways 2) is equal to AB cos (Brtially the same manner as before, but using a direction of longitudinal traverse opposite to that employed in profiling and drilling the first edge.

In the profiling of Work having tongue and groove edges, such as is shown in Fig. 8, no change in the profiling procedure is involved, the only difference lying in the use of formed cutters for cutting the tongue and groove instead of the plain cutter 53 used in forming work of section as shown in Fig. 7. Such formed cutters for cutting tongues and grooves and the like are well-known.

Various other types of cutter may also be employed without departing from the principle of the invention, and, where steel or the like is to be cut, an oxygen cutting jet may be used in place of a rotary cutter.

It will be understood that while mathematical expressions have been used in describing the shape of the work to be performed on the machine it is not suggested that the machine is capable of producing work in exact mathematical accordance with such expressions, as discrepancies both of theoretical and constructional character involve slight departures from such accuracy. With suitable precautions, however, which will be evident to those skilled in the art, the machine can be constructed to operate in accordance with the principles outlined to within a degree of accuracy sufiicient for the intended purpose of the work.

By varying the initial settings of the machine a considerable variety of work may be performed, and, within the limits of its constructional dimensions, the machine is capable of cutting profiles substantially in accordance with the general formula such profiles including concave curves and straight lines as well as convex curves.

Cutting tools other than a drill may also be mounted on frame 59, or on another similar, frame, to perform operations on the work, and in particular a small circular saw or a bandsaw may be mounted thereon to do a cutting operation. For example, a saw may be mounted on frame 59 to cut the work to size, and a finishing operation may, if so required, later be performed by the profile cutter 53. It will be understood that the movement of frame 59 is such as will guide a saw correctly in the line of the cut. It will also be understood that it is immaterial to the operation of the invention whether the table 4 is fixed and the carriage or saddle ll moved, or the carriage ll fixed and the table 4 moved, or both the carriage II and table 4 moved, as the necessary relative rectilinear movement between the carriage and the table may be produced in any of these ways.

I claim:

1. A machine for fabricating str-akes for boat construction or the like having a table for supporting the work, a carriage mounted for rectilinear movement relative to said table, mechanism for producing said rectilinear movement, an eccentric geared to said mechanism, an engaging member secured to said carriage, a slide mounted on said carriage for movement transverse to the direction of said longitudinal movement, a member pivotally mounted on said slide and having an engaging surface capable of engaging said engaging member, an eccentric-follower mounted on said pivotally mounted member and engaging said eccentric, a frame pivotally mounted on said slide, a cutting tool mounted on said frame, linkage co-acting with saidframe,

aevu-veo l said slide and said pivotally mounted "member to form a pantograph mechanism compellingmovement of said cutting tool proportional to the transverse movement of saideccentric follower,

aspring acting on-said pantograpnmechanism to maintain said eccentric follower in-engage= ment withsaid'eccentric and also'normally to maintain said engaging surface in contact with said engaging member, and clamping means to lock" said pantcgraph mechanism whereby said'- pantograph mechanism may alsdbe'caused to function as a rigid unit'so that the action ofsaid table to support the Work, longitudinal ways, a

saddleslidably mounted onsaid ways, mechanism to movesaid saddle, an eccentric rotatably mounted on said saddle; gearing connecting said eccentric to said mechanism, a slide capable of transverse sliding movement mounted on said saddle, an engaging member secured to saidsadfdie, a member pivotally mounted on said saddle and having an engagingsurface capable of engaging said engagingmember, an eccentric fol"- lower mounted onsaid pivotallymounted member and engaging said eccentric, a; frame pivotally mounted on" said slideandcarrying a cutting tool, a link connecting saidframe' to saidpivota'l 1y mounted member, a spring acting to maintain said eccentric follower in engagement with said eccentric and also normally to maintain said engaging surface in contact with said engaging member, and clamping means to inhibit pivoting movement of said pivotally mounted member and said frame whereby the action of said spring may, when so required, be rendered inoperative in maintaining said engaging surface in contact with said engaging member while remaining operative to urge said slide and so maintain said eccentric follower in engagement with said eccentric.

3. A machine for fabricating strakes for boat construction or the like having a longitudinal table to support the work, longitudinal ways, a saddle mounted on said longitudinal ways for longitudinal rectilinear movement relative to said table, mechanism to move said saddle, an eccentric rotatably mounted on said saddle, gearing connecting said mechanism to said eccentric, a slide mounted on said saddle for movement in a direction transverse to the direction of said longitudinal rectilinear movement, a frame mounted on said slide, a cutting tool mounted on said frame, an eccentric follower engaging said eccentric, a mounting for said eccentric follower supported on said slide, and connecting means coupling said frame with said mounting.

4. A machine for fabricating strakes for boat construction or the like having a longitudinal table to support the work, longitudinal ways, a saddle mounted on said longitudinal ways for longitudinal rectilinear movement relative to said table, mechanism to move said saddle, an eccentric rotatably mounted on said saddle, gearing connecting said mechanism to said eccentric, a slide mounted on said saddle for movement in a direction transverse to the direction of said longitudinal rectilinear movement, a cutting tool mounted on said slide, a mounting supported by said slide and an eccentric follower slidably mounted'on said mountingfor-longitudinal mcve ment and providedwith-a recess for engaging said eccentric.

5. A machine for fabricating strakes for boat I construction or thelikeliaving alongitudinal" table to support thawork, longitudinal ways, a"

saddle mounted onsaidlon'gitu'dinalways for longitudinal rectilinear" movement relative tosaidtable and having-"anengaging-member se:

- cured thereto, mechanism to movesaid saddle;

an eccentric rotatably m0unted' on said saddle,- gearing connecting "said mechanism to said eccentric, a slide mounted onsaid saddle for movement in a direction transverse tothe directionof' said" longitudinal rectilinearmovement, a frame iii-rem ber mounted onsaidslide for pivotal movement about-an axis substantially parallel tothe direc-' tion of said-longitudinal rectilinear movement,"

a rocking member also mounted onsaidslide for pivotal movement about an" axis substantially? parallel to the direction of said longitudinal rectilinear movement and provided with engaging means for engaging: said engaging member, a? cutting tool mountedon said frame-member, aneccentric follower mountedcn 'said'rocking mem ber and engaging saideccentr'i'c; and'alin'k hav ing its one end 'pivot'ally"secured"to'said' frame: member and its othen'endplvotallysecuredto said rocking member:

6. A machine for fabricating strakes for boat" construction or the like having a" longitudinal table to support the" work, longitudinarways; a"

saddle mounted onsaidlongitudinal'ways'for'lom gitudinal rectilinear movement relative to said table and having an engaging member secured thereto, mechanism to move said saddle, an eccentric rotatably mounted on said saddle, gearing connecting said mechanism to said eccentric, a slide mounted on said saddle for movement in a direction transverse to the direction of said longitudinal rectilinear movement, a member pivotally mounted on said slide and having engaging means for engaging said eccentric and said engaging member, a cutting tool pivotally mounted on said slide, means connecting said pivotally mounted member to said cutting tool and compelling movement of said cutting tool on movement of said pivotally mounted member, and clamping means to optionally lock said pivotally mounted member rigid with said slide to prevent pivotal movement of said pivotally mounted member.

7. A machine for fabricating strakes for boat construction or the like having a longitudinal table to support the work, longitudinal ways, a saddle mounted on said longitudinal Ways for longitudinal rectilinear movement relative to said table and having an engaging member secured thereto, mechanism to move said saddle, an eccentric rotatably mounted on said saddle, gearing connecting said mechanism to said eccentric, a slide mounted on said saddle for movement in a direction transverse to the direction of said 1ongitudinal rectilinear movement, a rocking member pivotally mounted on said slide and having engaging means for engaging said eccentric and said engaging member, a frame pivotally mounted on said slide and supporting a cutting tool, pivots located on said rocking member and said frame spaced at a distance from their axes of pivoting on said slide, and a link connecting said pivots; said link, slide, rocking member and frame coacting to form a pantograph linkage.

8. A machine for fabricating strakes for boat construction or the like having a table for supporting the work, a saddle mounted for rectilinear movement relative to said table, mechanism for producing said rectilinear movement, a slide mounted on said saddle for movement in a direction transverse to the direction of said rectilinear movement, a frame mounted on said slide for pivotal movement about an axis substantially parallel to the direction of said rectilinear movement, a cutting tool mounted on said frame, looking means between said frame and said slide for optionally locking said frame to form a rigid unit with said slide, an eccentric rotatably mounted on said saddle, gearing connecting said eccentric to said mechanism, and means mounted on said slide and connecting said eccentric to said frame and compelling movement thereof on movement of said eccentric, said movement being restricted tonon-pivotal movement of said frame as a rigid unit with said slide when said locking means is engaged to prevent pivotal movement of said frame.

9. A machine for fabricating strakes for boat construction or the lik having a longitudinal table to support the work, longitudina1 ways, a saddle mounted on said longitudinal ways for longitudinal rectilinear movement relative to said table, mechanism to move said saddle, an eccentric rotatably mounted on said saddle, gearing connecting said mechanism to said eccentric, a slide mounted on said saddle for movement in a direction transverse to the direction of said longitudinal rectilinear movement, a first frame mounted on said slide for movement in a direction 12 transverse to the direction of said longitudinal rectilinear movement, a second frame mounted on said first frame for pivotal movement about an axis located in a plane transverse to the direction of said longitudinal rectilinear movement, a cutting tool supported by said second frame, a mounting supported on said slide, an eccentric follower slidably mounted on said mounting for longitudinal movement, connecting means coupling said first fram with said mounting, and a motion-reducing mechanism engaged by said eccentric follower and engaging said second frame.

ALEXANDER G. S. SANDISON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 282,831 Aborn Aug. 7, 1883 644,445 Nerz Feb. 27, 1900 645,164 Dedrick Mar. 13, 1900 799,825 Behee Sept. 19, 1905 1,130,454 Wegner Mar. 2, 1915 1,325,789 .Johnsson Dec. 23, 1919 1,839,196 Cameron Jan. 5, 1932 1,969,740 Fitzpatrick Aug. 14, 1934 2,025,842 Afrieano Dec. 31, 1935 2,170,687 Johnson Aug. 22, 1939 2,345,494 Onsrud Mar. 28, 1944 2,366,831 C'artledge Jan. 9, 1945 

